Underground service vault



FIG. 1 is a perspective view of an underground service vault showing my new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a bottom plan view thereof;

FIG. 4 is a front elevational view thereof;

FIG. 5 is a right side elevational view thereof, the left side being a mirror image thereof; and

FIG. 6 is a rear elevational view thereof. 

The ornamental design for an underground service vault, as shown and described. 